Chemoselective Hydrogenation of Nitro Compounds with Supported Gold Catalysts

Nov 20, 2014

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Chemoselective Hydrogenation of Nitro Compounds with Supported Gold Catalysts. Avelino Corma* and Pedro Serna. Science 2006 , 313 , 332-334. Mechanism.

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mechanism
chemoselective hydrogenation
nitro compounds
avelino corma
pedro serna
supported gold catalysts

mason-carney

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Chemoselective Hydrogenation of Nitro Compounds with Supported Gold Catalysts

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Chemoselective Hydrogenation of Nitro Compounds with Supported Gold Catalysts Avelino Corma* and Pedro Serna Science2006, 313, 332-334

Mechanism

HYDROGENATION

HYDROGENATION. Hydrogenation Mechanism Factors Affecting Hydrogenation Hydrogen sources From Hydrocarbons Steam-Methane Reforming for the production of hydrogen. objectives. Alkene Reactions. A reaction where bonds are broken while hydrogen is added is called hydrogenolysis .

863 views • 26 slides

Amines and nitro compounds

Amines and nitro compounds. Vladimíra Kvasnicová. Amines. = organic derivatives of ammonia in which one or more of the hydrogen atoms is replaced by an alkyl or by aromatic group (R) ammonia NH 3 primary amine R 1 - NH 2 secondary amine R 1 - NH -R 2 tertiary amine R 1 - N (R 2 )-R 3

3.47k views • 14 slides

Hydrogenation Skid

Hydrogenation Skid. Hydrogenation Skid. Equipment Description: The skid is located in an explosion proof room Class-I Div-2 and capable to handle class C&D solvent. A special arrangement is made to handle hydrogen. The equipment skid is equipped with:

522 views • 9 slides

Hydrogenation of Alkenes

Hydrogenation of Alkenes. H. H. H. H. C. C. H. H. C. C. H. H. H. H. Hydrogenation of Ethylene. exothermic D H ° = –136 kJ/mol catalyzed by finely divided Pt, Pd, Rh, Ni. s. s. s. p. + H—H. CH 2. H 3 C. H 3 C. CH 3. H 3 C. H. H 3 C. Example. H 2 , Pt. (73%).

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Hydrogenation

Hydrogenation. Processed plant oils can be high in saturated fat Tropical oils (such as palm oil and coconut oil) used in processed foods are high in saturated fats Hydrogenated fats and oils are created from unsaturated fats are used to prevent spoiling and to add texture. Cholesterol.

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Optimization of Partial Hydrogenation Parameters

PARTIAL ALKYNE REDUCTION IN FLOW: ADAPTATION OF THE LINDLAR PROTOCOL PROMPTED BY A FLOW SYNTHESIS OF COMBRETASTATIN A-4 Laurent De Backer, Eduard Dolušić , Stéphane Collin and Steve Lanners * Laboratoire de Chimie Organique de Synthèse , Namur Medicine & Drug Innovation Center (NAMEDIC ),

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Catalysts

Catalysts. Catalyst-lowers activation energy of a chemical reaction and is neither a reactant or product. So what’s a cell got to do to reduce activation energy? get help! … chemical help…. Enzymes. G. Enzymes . Biological catalysts Proteins Lower activation energy

1.16k views • 16 slides

Catalysts

Catalysts. S1 Chemistry Introduction to Chemistry. Where do you find catalysts?. They are chemicals which speed up chemical reactions. Some chemical reactions won’t work without a catalyst. Every chemical reaction has its own catalyst. What are catalysts?. Catalysts are always solid.

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Role of Catalysts

Role of Catalysts . Homogenous vs. Heterogeneous Catalysts Determining E a for catalyzed reactions. What is a catalyst?. Substance that speeds up rxn without being consumed . How does it work?. Provides new pathway with a lower E a Creates new mechanism

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Quenching of positronium in Al 2 O 3 supported catalysts

Positron and Positronium Chemistry. Quenching of positronium in Al 2 O 3 supported catalysts. Z. Q. Chen, H. J. Zhang and S. J. Wang. Department of Physics, Wuhan University, Wuhan 430072, P. R. China. Outline. Introduction Sample preparation Experiments Results and discussion

521 views • 37 slides

Hydrogenation

Hydrogenation. Textbook H: Chapter 15.1 – 15.6 Textbook A: Chapter 14.1 – 14.2. Hydrogenation. All mechanisms involve metal hydrides. Oxidative addition Sigma-bond metathesis Heterolytic activation. Wilkinson’s catalyst: OA of H 2 (hydride mechanism).

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Kinetics and Mechanisms of hydrogenation of DMO

Kinetics and Mechanisms of hydrogenation of DMO. Li Siming 2012.9.8. C. Perego, S. Peratello, Catalysis Today 1999, 52 , 133-145. Internal Diffusion Effects. 当. 小于 0.1(0.15) 时，可认为无内扩散影响。. External Diffusion Effects. C. Perego, S. Peratello, Catalysis Today 1999, 52 , 133-145. 当.

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Hydrogenation of High-vinyl Polybutadiene

Hydrogenation of High-vinyl Polybutadiene. Hydrogenation of High-vinyl Polybutadiene. Olefin Hydrogenation Catalyzed by RhCl(PPh 3 ) 3. Modeling - Not Just for Beautiful People.

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CATALYTIC HYDROGENATION

CATALYTIC HYDROGENATION.

4.71k views • 20 slides

HYDROGENATION

HETEROGENEOUS CATALYSIS. HYDROGENATION. REVIEW OF HYDROGENATION. CATALYTIC HYDROGENATION. IS COVERED IN SEVERAL PLACES IN THE TEXT,. PRINCIPALLY:. Ch3 Section 3.18 Hydrogenation of Alkenes. Ch4 Section 4.13 Relative Stabilities of Alkenes.

937 views • 50 slides

Transfer Hydrogenation of Asymmetric Ketones using Transition Metal Catalysts

Transfer Hydrogenation of Asymmetric Ketones using Transition Metal Catalysts. Katie Cornish 4-12-2006 Student Scholarship Day. Introduction.

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Characterzation of Catalysts

Characterzation of Catalysts. Investigate: Structure/morphology Surface area Number of active sites Pore distributions Nature of active site Overall reactivity Turn over frequency (TOF) Selectivity Stability Heat and mass transport ? ?. The Surface Science Approach.

512 views • 37 slides

Hydrogenation

Hydrogenation. Wilkinson’s Catalyst. Activity:. Selectivity:. Directing Effects. Group binding affinities: amide > OH > OR > ester ~ ketone. Ru Heterolytic H 2 Activation. Lanthanide Hydrogenation Catalysts.

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I. Hydrogenation of Alkenes

Addition Reactions. Where two molecules add together and all the atoms of both molecules end up in the product. I. Hydrogenation of Alkenes. II. Addition of hydrogen halides. In the addition of HX to an alkene, the H goes to the carbon with more H’s. III. Addition of halogens. IV. Hydration.

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Hydrogenation of Unsaturated Compounds to Irradiation-Quantum Pd/- Al2O3 and Pt/-Al2O3

In the present research, we have made a survey on the influence of γ-rays (60Co sources) on the activity and selectivity of Pd/γ-Al2O3 (0, 5-5% Pd) in the reaction of liquid phase hydrogenation of cyclohexene, nitrobenzol and phenylacetylene. The samples Pd/γAl2O3 have been prepared by impregnating method γ-Al2O3 , previously calcined at 500°C for 4 hours with an aqueous solution of palladium chloride, followed by drying at 250°C. The resulting samples were recovered in a hydrogen stream for 2 hours at 500°C. The hydrogenation of unsaturated compounds was conducted in a thermo stated glass reactor-a catalyst "duck" in 96% ethanol at 10, 20, 30 and 40℃ with simultaneous measuring of the catalyst potential during the reaction relative to the saturated calomel halfcell.

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Catalytic Hydrogenation of Alkenes

Catalytic Hydrogenation of Alkenes. Catalyst with Hydrogen and alkene adsorbed. Hydrogen inserted into C = C. Alkane product released from catalyst. Catalyst with Hydrogen adsorbed. Alkene + H2 → Alkane. Heterogeneous catalyst Pt. Pd. Ni-tinely divided metal SYN addition of hydrogen.

262 views • 12 slides

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